/*
 * Created on 16 May 2006
 * Created by Paul Gardner
 * Copyright (C) Azureus Software, Inc, All Rights Reserved.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 *
 */

package com.aelitis.azureus.plugins.extseed.impl;

import java.util.List;

import org.gudy.azureus2.plugins.peers.PeerReadRequest;

import com.aelitis.azureus.plugins.extseed.ExternalSeedException;
import com.aelitis.azureus.plugins.extseed.util.ExternalSeedHTTPDownloaderListener;

public class ExternalSeedReaderRequest implements ExternalSeedHTTPDownloaderListener {
    private ExternalSeedReaderImpl reader;

    private List<PeerReadRequest> requests;

    private int start_piece_number;
    private int start_piece_offset;

    private int length;

    private int current_request_index = 0;
    private PeerReadRequest current_request;
    private byte[] current_buffer;
    private int current_position;

    protected ExternalSeedReaderRequest(ExternalSeedReaderImpl _reader, List<PeerReadRequest> _requests) {
        reader = _reader;
        requests = _requests;

        for (int i = 0; i < requests.size(); i++) {

            PeerReadRequest req = (PeerReadRequest) requests.get(i);

            if (i == 0) {

                start_piece_number = req.getPieceNumber();
                start_piece_offset = req.getOffset();
            }

            length += req.getLength();
        }
    }

    public int getStartPieceNumber() {
        return (start_piece_number);
    }

    public int getStartPieceOffset() {
        return (start_piece_offset);
    }

    public int getLength() {
        return (length);
    }

    public byte[] getBuffer()

    throws ExternalSeedException {
        if (current_request_index >= requests.size()) {

            throw (new ExternalSeedException("Insufficient buffers to satisfy request"));
        }

        current_request = (PeerReadRequest) requests.get(current_request_index++);

        current_buffer = new byte[current_request.getLength()];

        current_position = 0;

        return (current_buffer);
    }

    public boolean isCancelled() {
        for (int i = 0; i < requests.size(); i++) {

            PeerReadRequest req = requests.get(i);

            if (req.isCancelled()) {

                return (true);
            }
        }

        return (false);
    }

    public void done() {
        reader.informComplete(current_request, current_buffer);
    }

    protected void cancel() {
        for (int i = 0; i < requests.size(); i++) {

            PeerReadRequest req = requests.get(i);

            if (!req.isCancelled()) {

                req.cancel();
            }
        }
    }

    public void failed() {
        for (int i = current_request_index; i < requests.size(); i++) {

            PeerReadRequest request = requests.get(i);

            reader.informFailed(request);
        }
    }

    public void setBufferPosition(int pos) {
        current_position = pos;
    }

    public int getBufferPosition() {
        return (current_position);
    }

    public int getBufferLength() {
        return (current_buffer.length);
    }

    public int getPercentDoneOfCurrentIncomingRequest() {
        PeerReadRequest req = current_request;

        if (req == null) {

            return (0);
        }

        return ((100 * current_position) / req.getLength());

    }

    public int getPermittedBytes()

    throws ExternalSeedException {
        PeerReadRequest req = current_request;

        if (req == null) {

            req = requests.get(0);
        }

        if (req.isCancelled()) {

            throw (new ExternalSeedException("Request cancelled"));
        }

        return (reader.getPermittedBytes());
    }

    public int getPermittedTime() {
        return (0); // no timeout
    }

    public void reportBytesRead(int num) {
        reader.reportBytesRead(num);
    }
}
